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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c08a85f23a65ba4e701ce7306b656b97d94a5c415b5878afb798f10435ccb439' 
  AND token = 'EfRM05tt5+RgFysIbnb+JtEhxNWyiYm6BQfRLQJCi40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}